Matrix direct sum

[raghu81]

Hello everyone,

Thanx for the previous answers. Spl thanx to xwb.

I need help in coding matrix direct sum. I have 'n' matrices of varying size. I want to read them as a single matrix as the direct sum of all the 'n' matrices.

I have 'n' matrices P and the sizes of the matrices Size. I want to do a direct sum to get a matrix

P(1) 0 0 ...
D = 0 P(2) 0 ...
0 0 P(3) ...
. . .
. . .

Thanx in advance,
raghu.

 

[robinav]

That is not a "sum" of matrices.

You need to define one large array that will accommodate
all the elements that you want.

Then for each little matrix, you write:

x(1:m,1:n) = a

where a is dimensioned as a(m,n)
for the first little array,

x(m+1:m+q, n+1:n+r) = b

(where b is dimensioned as b(q, r)

for the second, etc.